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March 4, 1952

Joe Walker was the first to fly the variable-geometry wing X-5 to a full 60-degree wing-sweep angle, adjusted in flight.
Joe Walker was the first to fly the variable-geometry wing X-5 to a full 60-degree wing-sweep angle, adjusted in flight.

Joe Walker was the first to fly the variable-geometry wing X-5 to a full 60-degree wing-sweep angle, adjusted in flight. The X-5 derived from the Messerschmitt P.1101, a German experimental aircraft from WWII whose wing angles could only be adjusted on the ground. The concept has since been used on the F-14, F-111, and B-1 aircraft.NASA Photo
E-810